Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca479f720e900fb0…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 18:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f2d67c0330ae2fb96cb5cdeb21126a5 SHA-1: 9e75ea50cabcd797fac3456bda5e3f2d566c7766 SHA-256: ca479f720e900fb0dac5595562df925febe7ff2ce63b7a1cc506559f667084ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to other PDF files hosted on various compromised websites. This behavior is characteristic of a link farm designed to distribute malicious content, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=unable+to+see+phone+contacts+in+android PDF link annotation
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/43028100909.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/doxabajadu.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/73501428588.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/37555558249.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/70434899236.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/37vgi8mven4ec5u8up17urt7e7/dulefonuworimitido.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613919dd99145---bipin.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/693e3f3d8c2520826cdc09d0f79d1b01/11381376190.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/48908217843.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/99695419408.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/vipuvisiseleputeri.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/12492050415.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/nutumojon.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/93380141314.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210903_DF4BBF40DAE3E87F.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/zijefefi.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/98864269023.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/nonalapoxixisirikabow.pdfIn PDF document text
    • http://kd-council.com/upfile/files/43691722985.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/46870524608.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9020a485---34679016765.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/2063763653.pdfIn PDF document text
    • http://emaaravm.net/upload/files/bikigorek.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/nudajoxerakipowomuw.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/gosemavoxora.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 10756 bytes
SHA-256: 87526af4886c1fb15f48be377582778a88d8737ac815eae7056b5913f2065ff8
font_02_sfnt_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 17844 bytes
SHA-256: 4cf458a1e33504ee1da09218608dbafa993af91f61cfec22d266e1fbdc24e277